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Supporting mods to run 37s offroad

Discussion in '2.5 Gen Tundras (2014-2021)' started by L3TT3RS, Oct 11, 2018.

  1. Oct 11, 2018 at 8:23 PM
    #1
    L3TT3RS

    L3TT3RS [OP] New Member

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    I've done a bit of searching and see that most recommend swapping to 4.88 gearing to run 37s.

    My question is, other than gears with cmc, some trimming, and suspension lift, are there other supporting mods necessary to run 37s without breaking stuff for moderate offroad?
     
  2. Oct 11, 2018 at 8:41 PM
    #2
    zcarpenter92

    zcarpenter92 Yotas and Yellow Jackets

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  3. Oct 11, 2018 at 8:42 PM
    #3
    papasmurf

    papasmurf Savage Fabrication

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    Honesty the gears are not required but a nice to have ... a lift and some trimming and hit the dirt
     
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  4. Oct 11, 2018 at 10:30 PM
    #4
    KevinK

    KevinK SGU - High Speed Overlander

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    I have instructions in our build thread. Look in the table of contents for 37s and body mount chop.

    https://www.tundras.com/threads/komodo-my-wifes-daily-driver-and-high-speed-overland-rig.16989/

    It depends very heavily on the offset of your wheels. Too much offset (like 0 or a negative number) makes it super hard to clear on a low lift like we have, 2/1 basically. Around +18 or so is really good.
     
  5. Oct 11, 2018 at 10:36 PM
    #5
    MOTORHEAD

    MOTORHEAD New Member

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    RCD 6" SUSPENSION LIFT,ICON EXTENDED FRONT COILOVERS,3" BODY LIFT,CAMBURG UPPER CONTROL ARMS.REAR DISK BRAKE CONVERSION,BIG BRAKE FRONT CONVERSION, AND MANY MORE
    you need to re gear your rear end to the correct gear ratio to correct your speedometer ,and also get your engine rpm/powerband to where it should be. it will make your transmission shift properly and also take some of the strain off your drive-line components. the right gear ratio depends on your engine/transmission combination. talk to a rear-end shop.
     
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  6. Oct 11, 2018 at 11:41 PM
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    L3TT3RS

    L3TT3RS [OP] New Member

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    Thanks I will take a look
     
  7. Oct 11, 2018 at 11:58 PM
    #7
    L3TT3RS

    L3TT3RS [OP] New Member

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    @KevinK I read through that... that's a lot of cutting. I'll keep that in mind and bookmarked for the future. We will see where I'm at on my 2.75 and 35s. I may be happy as a lark.
     
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  8. Oct 12, 2018 at 5:23 AM
    #8
    osidepunker

    osidepunker OsidePunker

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    No, you don't.

    And gears wont correct your speedo

    I run 37s with stock gears. The Truck is a dog, but I also weight 8000 lbs. Gears would help bring a little power back and stop the trans from from hunting on the freeway, but they are not a necessity.
     
  9. Oct 12, 2018 at 9:34 AM
    #9
    KevinK

    KevinK SGU - High Speed Overlander

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    Yeah, it seems like a lot when you're reading through it, but it's not actually too bad once you get under there and start doing it. Body mount, pinch weld, front bumper if it's stock, skid plate if it's stock, delete sway bar if it interferes. It's just time consuming to measure, trim, measure, trim, rinse, repeat...
     
  10. Oct 12, 2018 at 9:41 AM
    #10
    trayday

    trayday New Member

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    If you go gears with the 37's, a Speedo Calibrator is nice to have for dash gauges. Even with 4.88's and 37's, more mid range TQ would be nice. I have the BAMuffler 8" system, the truck does fine with normal driving and towing 4k lbs but more power would be nice.
     
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  11. Oct 12, 2018 at 9:49 AM
    #11
    joonbug

    joonbug °°°°°°°°°°

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    Get a locker or lsd while you're at it.
     
  12. Oct 14, 2018 at 6:47 AM
    #12
    MOTORHEAD

    MOTORHEAD New Member

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    If you re gear the rear end your engine and trans won’t have to work so hard. I changed from a 3:90 ratio to a 4:88 gear. Truck has a lot more power, trans shifts back like it should runs better
     
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  13. Oct 18, 2018 at 8:04 PM
    #13
    KevinK

    KevinK SGU - High Speed Overlander

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    Yeah that’s especially noticeable on the 3.90.
    The 07+ comes with either 4.10 or 4.30 from the factory so it’s less necessary to regear. We’ve been running 37s on the stock 4.30 for a couple years now and it’s not bad. Someday we’ll regear when add lockers.
     
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  14. Oct 18, 2018 at 8:23 PM
    #14
    L3TT3RS

    L3TT3RS [OP] New Member

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    So, 37s are out. My skinny 35s on my mild lift is where it's at. May reconsider 37s in the far future. The little amount I drive itd take 10 years to wear the tires out I have now
     

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